My contract ended, and I took it as an opportunity to spend some time nurturing my own young children. I simply couldn't be a good mum and jump through all the hoops. I owe my children more than other peoples'.
The target/ data culture means teaching to the test and sucks the joy out of learning.
I'm in one of Gove's chosen subjects so my GCSE groups were getting larger and having more and more disinterested students that had lost the opportunity to do creative or vocational subjects and were being shoehorned in through a small list of choices.
The targets are often irrelevant, based on SATs results that they were coached for years ago in another subject. (When I had to have my 5 year old in with me due to strike action, I got him to finally explain a concept to these 15 year olds who were targeted at Bs and Cs yet could barely string a written sentence together)
Strong blame culture and fear of capability proceedings. Difficult parents being unsupportive and undermining. Unsupportive management (actually, my last school was supportive, I had great colleagues, and the systems were quite efficient, but that's been ripped up by the new head since I left)
Constant change for changes sake. Constantly replanning, no funds for new resourcing so all resources have to be made yourself. They must be active and engaging and on minimal paper as, the printing budget is very, very finite.
The paperwork/ double marking got to the stage where some days I'd resent the lesson time for getting in the way, of the admin. Workload. Taking your 5 year old in in the holidays for "film day" on the projector because the 50 GCSE books were too heavy to lug home. The poor kid spent more time in childcare than the European Working Time Directive and he didn't have the option to opt out.
I love teaching, despite the behaviour and lack of pens, but the superfluous admin/ marking load has finished me. My dad worked himself to death in his early 50s (not teaching). I'm not volunteering to work myself to death in any sector.